Quiescence estivale et dormance chez Ginkgo biloba L

Abstract

The apical bud of the Ginkgo's seedling stops early all its activity. It reaches a summer resting stage, the deepness of which is a function of time. This rest is relatively easy to break by applying long days. During autumn, the bud reaches progressively a deeper resting stage, which is in fact a winter rest. To break this winter rest, the cold seems most effective. Whenever the breaking of summer-or winter rest is performed, brachyblasts and / or auxiblasts become shooted. Age and stage of development (physiological age) are two limiting factors for the integrated action of chilling and of long days